Astleford No. 1 Reservoir Report
Nearby: Krogman #1 Carl Gunner No.1
Last Updated: December 8, 2025
Astleford No.
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Summary
1 is a privately owned dam located in Mellette, South Dakota, along the tributary of Pine Creek. This earth dam stands at 27 feet high and stretches 220 feet in length, with a storage capacity of 18 acre-feet. Completed in 1965, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and has a low hazard potential.
While the dam's condition assessment is currently listed as "Not Rated," it is subject to state inspection, permitting, and enforcement. Despite its low hazard potential, Astleford No. 1 plays a crucial role in water resource management in the area. With a maximum discharge capacity of 325 cubic feet per second, the dam serves as a vital infrastructure for flood control and water storage in the region.
As a key structure in the St. Paul District, Astleford No. 1 contributes to the overall water resource management efforts in South Dakota. With its strategic location and regulatory oversight by the DENR, this dam serves as a testament to the importance of maintaining and monitoring water infrastructure in the face of changing climate conditions. For water resource and climate enthusiasts, Astleford No. 1 offers a case study in the intersection of human intervention and natural processes in safeguarding our environment.
Year Completed |
1965 |
Dam Length |
220 |
Dam Height |
27 |
River Or Stream |
TRIB. PINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
18 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Astleford No. 1